New add-on called "Google®
virtual drive plug-in" can be used to turn Google Drive™ into a
zero-install, inexpensive, yet capable XML document repository. See "Getting started" screencast. See add-on documentation. (Google and Google
Drive are trademarks of Google Inc.)
Note that this add-on is not included by default in XMLmind XML Editor distributions. You'll have to download it and install it using menu item "Options|Install Add-ons".
More info here.